Practice maneuvers of United States Army Air Service 1st Provisional Air Brigade commanded by Brigadier General James Fechet in the United States. The brigade from Langley Field, flying over Alexandria, prepares a mock attack targeted at the United States capital city of Washington DC. U.S. Army Air Service Airco DH4 aircraft in flight. The mock attackers reach the Lincoln Memorial in spite of the heavy rain. Rows of Navy buildings near the memorial. The DH4 aircraft above the area. The attack group in formations over Washington DC. Views of the Potomac River Bridges including the Aqueduct Bridge near newly built Key Bridge. The pursuit group attacks the enemy fleet from above and below at the same time.